Portable telephone



FIG. 1 is a bottom, front and left side perspective view of a portable telephone showing our new design in a closed position;

FIG. 2 is a top, front, and right side perspective view of a portable telephone showing our new design in an open position;

FIG. 3 is a top plan view of a portable telephone showing our new design in a closed position;

FIG. 4 is a rear elevation view of a portable telephone showing our new design in a closed position; and,

FIG. 5 is a right side elevation view of a portable telephone showing our new design in a closed position. 

The ornamental design for a portable telephone, as shown and described. 